27
There are 6C3 = 20 such combinations.
There are 5C3 = 10 combinations.
You could make 10*10*10*26*26*26 combinations, or 17576000 combinations.
There are 9C3 = 84 combinations.
9
There are: 35C3 = 6545 combinations
233 = 18 combinations.
There are 5C3 = 10 combinations.
There are 6C3 = 20 such combinations.
3 items each in 3 categories gives 3*3*3 = 27 possible combinations.
There are 9C3 = 84 combinations.
8
9
There are about 57 words that are combinations of the letters A through G There are about 57 words that are combinations of the letters A through G
I am assuming you mean 3-number combinations rather than 3 digit combinations. Otherwise you have to treat 21 as a 2-digit number and equate it to 1-and-2. There are 21C3 combinations = 21*20*19/(3*2*1) = 7980 combinations.
4 pitchers * 3 catchers = 12 combinations
7*3*4 = 84 combinations.